It really is more like a 5.5. The story is mmm ok, but the win is the lovely Almudena Amor, the direction, and the editing.
Rolling up on HBOMax today this movie is #2 in Spain, and after watching I get why. It's an easy watch with all the things Spanish horror lovers love - supernatural elements, blood, seemingly endearing characters, nudity, a little more blood, an affair, quick zoom edits, creepy repetitive music, but the coup de gras for me was the wink and a nod to Amor's catalogue at the very end a la "abuela," referencing a character but also the just a few years ago movie she was is which has nothing to do with this movie. Moving on.
In short, Amor possesses the young believable ingenue just as Jamie Lee did 40 some odd years ago, and while at least in this interation she doesn't qualify as a "scream queen" proper, her ability to distill her character and keep the wee plot afloat makes it all worth it.